Electric hammer.



J. 0. 8: R. L. FIELDS.

ELECTRIC HAMMER.

APPLICATION FILED JAN.13, 1912.

1,083,817. Patented Jan. 6, 1914.

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J. O. & R. L. FIELDS.

ELECTRIC HAMMER.

APPLICATION FILED JAN.13, 1912.

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UNITED STATES PATENT OFFICE.

JOHN 0. FIELDS AND ROBERT L. FIELDS, OF ZANESVILLE, OHIO.

ELECTRIC HAMMER.

Application filed January 13, 1912.

To all whom it may concern:

Be it known that we, JOHN 0. Firms and ROBERT L. FIELDS, citizens of the United States, and residents of Zanesville, in the county of Muskingum and State of Ohio, have invented a new and Improved Electric Hammer, of which the following is a full, clear, and exact description.

Our invention relates generally to electric hammers and more particularly it is directed to a new and improved adjustable contacting device actuated by the beam of the hammer whereby the travel of the hammer head may be varied.

The principal Object of our invention is to provide an improved contacting device especially adapted for use on electric hammers and adapted to be actuated by the beam of the said hammer whereby the distance through which the hammer head travels may be varied.

A further object of our invention is to provide a new and improved actuating device whereby the amount of resistance in the electric circuit may be varied, thereby varying the force with which the hammer head meets the object held on the anvil.

Other objects and advantages of the invention will appear as the description thereof proceeds, all of which is particularly pointed out and included in the appended claims.

Reference is to be had to the accompanying drawings forming a part of this specification in which similar characters of reference denote corresponding parts in all the views, and in which Figure 1 is a side view of the electric hammer; Fig. 2 is a detail view of the end of the base adjacent the anvil showing the switch whereby the resistance in the circuit may be varied; Fig.3 is a sectional view on the line 3-3 of Fig. 1; Fig. dis a sectional view on the line 14 of Fig. 5; Fig. 5 is a vertical sectional view through the contacting device and the elements adjacent thereto; Fig. 6 is a sectional view on the line 6-6 of Fig. 5; Fig. 7 is a diagrammatic view showing the arrangement of the circuit.

Referring generally to the subject-matter of this application, the hammer proper is carried on a suitable beam which is actuated by a solenoid, there being a suitable contacting device actuated by the beam Specification of Letters Patent.

Patented Jan. 6, 1914.

Serial No. 671,028.

whereby the circuit through the solenoid is broken at stated intervals, a suitable spring bemg provided to return the beam to its upper position ready for the next stroke. Suitable means are provided whereby the distance through which the hammer travels may be varied, and other means under the control of the operator are also provided whereby the force with which the hammer meets the object held on the anvil may be varied.

The hammer is particularly adapted to serve the purposes of a trip hammer which heretofore has been operated by a belt requiring a line of shafting. The particular use to which the hammer is especially adapted is in chain mills, socket shops, pick shops, etc., where quick-acting hammers are necessary. The drawings show the preferred form of the device and, while the electric operating circuit is represented diametri cally, it is obvious that said circuit may embody suitable safety devices and other accessories whereby the safe operation of the outfit is insured, such details of construction being included within the spirit of the invention although not specifically set forth in the drawings or described in the specificatlon.

Any suitable base plate 1 is provided with a support 2 adjacent one end having an anvil 3 thereon, there being a second support 1 adjacent the opposite end of the base plate, or a plurality of such supports, between which the solenoid or electro-magnet 5 is pivotally supported by means of suitable pins 6. Intermediate of the supports 2 and 4 is a third support 7 of bifurcated construction, the beam 8 of the hammer extending between the bifurcated ends and being pivotally supported in position, preferably by means of a suitable pin or bolt 9. Adjacent the forward end of the beam 8 is a hammer head 10 adapted to be moved toward and away from the anvil 3, the rear end of the beam being provided-with an adjustable collar 11 secured in position on the beam by means of a suitable lock-bolt 12, the collar being provided with a slot 18 within which a pin 14 carried by the lower end of the plunger 15 moves, the plunger being positioned within the solenoid 5. In order to hold the beam in inoperative position as shown in Fig. 1, any suitable spring or resilient device 16 may be used, the spring in this instance being secured at one end 17 of the support 7, the free end of the spring bearing against the beam 8. A cushioning device 16 is positioned adjacent he other end of the beam.

From the above description of the structure of the machine it is apparent that if current is passed through the solenoid or electro1nagnet 5, the plunger will be drawn into the solenoid, the rear end of the beam 8 swinging up and the forward end with the hammer 10 swinging down adjacent the anvil 3 and into engagement with any article held. on the anvil. in order to vary the distance through which the hammer head 19 swings as well as the force with which it is brought adjacent the anvil, a suitable contacting device is provided, shown especially in Figs. 1, 1 and 5.

Extending rearwardly from the support 7 are the arms 18, the outer ends of which are connected together b means of an upright 19 suitably held in position, there being a contacting rod 20 carried bythe arms 18 but held out of electrical contact therewith by means of suitable insulating bush ings 21 the upper end of the rod is provided with a suitable binding post 22 from which a wire leads. Slidingly mounted on the uprights 19 is a block 23 of insulating material having an opening 2% extending therethrough, there being a contacting finger 25 positioned within this opening and pivotally held by means of a pin 26, the outer end of the finger being curved or hooked, as at 2?, and adapted to contact with the rod 20 at certain periods; secured to the rear of the block 23 is a resilient member 28 having pockets 29, 30, formed therein, the iockcts being separated by means of an intermediate portion 31, one end of the contacting finger 25 being adapted to be seated in either pocket 29, or 30, in a manner to be presently described. Hvotally secured. to the block 23 by means of a suitable pin 32 is a pitinan 33, the upper end of which is in pivotal engagement at with the beam 8; as the rear end of the beam 8 swings about the pin 9 as a center, the pitman will reciprocate the block 23 on the uprights 19. It will be noted from 5 that the resilient member 28 has a wire 3stconnected thereto and extending to one terminal of the solenoid or electro-magnet 5.

Slidably mounted on the uprights 19 and the lower block 35 is also slidably mounted on the uprights 19, being carried at the outer bifurcated end of the arm 41 which is mounted on a second shaft 412 also carried by the support 7. As the hammer reciprocates the block 23 which carries the contact linger moves up and down until it meets either of the pins 36 when, by reason of such engagement, the outer end of the finger is moved away from the rod 20 whereby the circuit between the wire 34: and the wire leading from the binding post 22 at the upper end of the rod 20 is broken: in order to move the sliding blocks 35 to different positions on the uprights 19, thereby limiting the movement of the beam 8 and the hammer 10, means preferably of the following construction are provided.

Secured to the shafts 3S and 42 carried by the support 7 are the arms e3, 44:, there being connecting rods 15, 46, extending, from these arms and pivotally secured to the hand levers 4H, 4.8, which are pivotally mounted at 19, 50, on the support 2. Each of the hand levers is provided with a suitable pawl 51, 52, adapted to engage the teeth in the quadrants 53, adjacent the lower ends of the hand levers, wherel'iy, as the levers are moved back and forth about their points of pivotal support, the blocks 35 will be moved along the uprights 19 into different positions, the engagement of the pawls with the teeth on the quadrants holding the parts fixed in adjusted position. Referring particularly to Fig. 2 it will be noted that on one side of the support 2 which carries the anvil 3 is a foot lever pivoted at an intermediate point 61 to the support and in convenient position for movement by the operator standing near the anvil, the outer end of the lever being provided with a contacting piece 2 adapted to come into engagement with any one of a plurality of separate contacts 63 carried on the base 2, the outer contact piece being connected to the sour e of power 641, which may be a battery or a power circuit, by means of a wire 65. Adjacent the foot lever 69 is another lever 68 pivotally mounted on the support at 67, the downward movement ofthis lever being determined by a pin 68 eXtendin g from the side of the support 2, the pin on which the lever moves being connected by a wire 69 to the contactin rod 20 of the ad iustaole contacting device, the outer end the lever being adapted to engage a contact plate 69 carried on the foot lever 60 when this foot lever has been moved a suitable distance. Such co struction provides that the foot lever when in inoperative position and on open circuit is not connected to either side of the circuit because the contact between the outer end of the lever 66 and 69 on the foot lever is broken, the determining the downward travel th pl a to n 68 ni r I v of the lever 66 and holding it remote from the contact plate 69. I

The complete electrical circuit of the hammer is set forth in Fig. 7 wherein the winding of the electro-magnet is designated 70 and the numerous resistance coils included between the contacts 63 on the support 2 are designated 71; the connecting wire between the lever 66 and the contacting rod 20 designated 69, while the return wire between the winding 70 of the electro-magnet and the source of power 64 is designated 7 3, although it is clear that, as in the drawings, this wire 73 may be omitted and the frame of the machine itself used as part of the circuit.

When the parts are in the position shown in Fig. 1, if the electric circuit is closed, the plunger 15 will be drawn into the solenoid or electro-magnet 5, the rear end of the beam 8 moving up and the forward end moving down, this movement continuing until the contact finger 25, the outer end of which is in electrical contact with the contacting rod 20, comes into engagement with the downwardly extending pin 36 when this contact will be broken, as indicated in broken lines in Fig. 5, the outer end of the contact finger 25 then engaging in the pocket 29 of the resilient element 28 carried by the sliding block 23 so that the circuit is maintained open, the spring 16 then returning the beam to normal position, the block 23 sliding down the uprights 19 until the contacting finger 25 meets the lower upwardly extending pin 36 when the finger again comes into electrical contact with the contacting rod 20, the outer end of the finger then engaging in the pocket 30 of the resilient member 28; it is clear that by movement of the hand levers 47 or 48, the posi tion of the upper and lower blocks 35 may be varied Within certain limits, whereby the distance through which the hammer moves may be varied, thereby providing for a quick succession of short movements or a slower succession of larger movements, the resulting effect on the article laid on the anvil 3 being thereby varied. The circuit is closed when the foot lever 60 is moved downwardly, the current supplied to the electro-magnet 5, and hence the lifting power of the magnet, being varied by the electro-motive force applied to the winding, this electro-motive force being varied by moving the foot lever over the different contacts 63 so that the resistance in the circuit may be varied; it is obvious that with a maximum of resistance in the circuit the force with which the hammer head 10 will meet the anvil 3 will be a minimum, while with no resistance whatever in the circuit the maximum force with which the parts may engage is possible.

The hammer may be put to a variety of uses and the size and shape of the particular parts is capable of wide variation in matters of design and workmanship, such changes being included within the spirit and scope of the appended claims.

Having thus described our invention we claim as new and desire to secure by Letters Patent 1. An electric hammer comprising a hammer beam, means for operating the same, an electric circuit including the beam operating means, an upright, a block slidably mounted on the upright, the block being adapted to be connected to the beam of the hammer, a contacting finger carried by the block and adapted to close and open the circuit through the beam operating means and other blocks adapted to occupy various positions, the said blocks being provided with parts which the said finger is adapted to engage as the first block moves whereby the circuit may be opened and closed through the beam operating means, thereby providing for oscillation of the hammer.

An electric hammer comprising a ham- ,mer beam, means for operating the same, an

electric circuit including the beam operating means, uprights, a block having a finger pivoted thereto, the block being slidably mounted on the uprights, the block being adapted to be actuated by the beam of the hammer, a fixed rod with which the finger is adapted to contact whereby the circuit. through the operating means of the beam is closed, and other blocks having parts extending therefrom with which the said finger is adapted to engage in difierent positions of the first block whereby the circuit through the said operating means may be opened and closed at the proper times.

3. A contacting device for use with electric hammers comprising suitable uprights, a block mounted on the uprights, a finger pivotally carried by the block, a fixed member with which the finger is adapted to contact, blocks mounted on the uprights having parts extending therefrom with which the said finger is adapted to engage during the movement of the block whereby the finger will be moved into and out of engagement with the said member, and means whereby the said second blocks may be moved into different positions, thereby varying the distance through which the first block will move before it contacts with the parts on the second blocks.

4. A contact device comprising uprights, a block slidably mounted on the uprights, a finger movably carried on the block, a fixed element with which the finger is adapted to contact, blocks on opposite sides of the first block, and having parts extending therefrom with which the finger is adapted to engage during movement of the first block whereby the contact between the finger and the fixed element may be opened and closed, and means for changing the positions of the second blocks whereby the distance through which the first block moves before it engages the parts on the said second blocks may be varied.

5. A contacting device comprising suitable uprights, a block slidably mounted thereon, a finger movably carried on the block, a fixed element with which the finger is adapted to contact, movable blocks on opposite sides of the first block and having parts thereon with which the finger is adapted to engage as the first block is moved, shafts, arms on the shafts, the said arms being connected to the said second blocks, together with means for moving the shafts independently of each other, thereby changing the po sitions which the second blocks may occupy in order to vary the travel of the said movable blocl: before it engages the parts on the said second blocks.

(3. An electric hammer comprising a beam having a hammer head thereon for cotiperation with a suitable anvil, a pivoted solenoid, a plunger within the solenoid, the plunger being in engagement with the beam, means for maintaining the hammer head remote from the anvil, an electric circuit comprising the solenoid whereby the hammer head may be brought adjacent the anvil, a contacting device in the said circuit, the contacting device comprising a movable block having a finger thereon, a fixed element with which the finger engages when the hammer head is removed from the anvil, and slidable blocks having parts extending therefrom with which the finger is adapted to engage as the slidable block moves back and forth in order to open and close the circuit through the solenoid, together with means comprising suitable hand levers for independently var ing the position of either slidable block in order to vary the travel of the said hammer head.

7. An electric hammer comprising an anvil, a beam having a hammer head thereon for cooperation with the anvil, a solenoid, a plunger carried by the beam and entering the solenoid, means for maintaining the hammer head remotefrom the anvil, an elec tric circuit comprising the said solenoid for bringing the hammer head adjacent the anvil, a contacting device in the said circuit, the said device comprising a movable member actuated by the beam, a movable contact member carried b the said movable. member, a second contact member adapted to be engaged by the first contact member, and means cooperating with the first contact member to move the same to open and close the circuit, the said means being adjustable, whereby the travel of the hammer head relatively to the said anvil may be varied.

8. An electric hammer comprising a beam having a hammer head thereon, an anvil 00- operating with the said hammer head, an electro-magnet device, the said device being cooperatively associated with the said beam, an electric circuit comprising the said device for bringing the hammer head adjacent the anvil, a contacting device in the said circuit, the device comprising a movable member having a finger thereon, a fixed element with which the finger engages when the hammer head is remote from the anvil, slidable elements having portions with which the said finger is adapted to engage as the slidable member moves back and forth, whereby the said electric circuit is opened and closed, and levers cooperatively associated with the said movable elements of the contacting device, whereby the position of the elements may be varied in order to determine the travel of the said hammer head when the machine operates.

9. A contacting device such as described, comprising a. supporting element, a block movably mounted on the element, means whereby the block may be moved, a finger carried by the block, a member with which the finger is adapted to engage, and other blocks carried by the said supporting structure, adapted to occupy various positions, the second blocks being provided with parts with which the said finger engages as the block carrying the finger aporoaches either of the said second blocks, uhe engagement of the finger with one ot the second blocks opening the said circuit, and the engagement of the finger with the other of the said second blocks closing the said circuit.

10. A contactin device comprising uprights, a block slidably nounted on the uprights, a finger movably carried on the block, the finger being of conducting material, a fixed element with which the finger is adapted to contact, the said finger and the said clement forming portions of an. electric circuit, movable blocks having parts thereon with which the finger is adapted to engage, the said block ca *rying the finger being positioned between the said second blocks, movement of the first block in one direction bringing the finger into engagement with one of the second blocks, whereby the finger is brought out of engagement with the said element, means for maintaining the finger in. such position, the said finger engaging the other of the said second blocks when the first block comes adjacent thereto, whereby the finger is again brought into contact with the said element and the circuit is opened and closed.

11. A contacting device for electric hammers, comprising an upright, a block of insulating material slidably mounted on the upright, a movable contact member carried by the block, a fixed conta -t with which the said member is adapted to engage, and other blocks adjustable in position, the last mentioned blocks being provided with members for engaging the said movable contact member as the first block is moved to move the said contact member into and out of engagement with said fixed contact.

12. A contacting device for use with electric hammers, comprising uprights, a block of insulating material having a contact finger pivoted thereto, the block being slidably mounted on the said uprights, a fixed contact rod with which the finger is adapted to contact, and blocks having members extending therefrom with which the said finger is adapted to engage in different positions of the first block, whereby the contact finger will be moved into and out of engagement with the said contact rod.

13. An electric hammer comprising a beam having a hammer head thereon, an anvil with which the hammer head cooperates, an electromagnetic device cooperating with said beam for moving the hammer head toward the anvil, an electric circuit including said device, means for moving the beam to carry the hammer head away from the anvil, a contacting device in the said electric circuit, the contacting device comprising a member mounted to reciprocate, means for reciprocating the said member from the beam, a movable contact carried by said member, a fixed contact with which the movable contact is adapted to engage, and adjustable means located at opposite sides of the said reciprocating member and adapted to be engaged by the movable contact as the said member is reciprocated to move the said contact and open and close the circuit.

14. In an electric hammer, a pivoted beam having a hammer head thereon, an electromagnetic device for moving the hammer beam in one direction, means for moving the hammer beam in the opposite direction, a member mounted to reciprocate, a pitman connecting the hammer beam with the said member to reciprocate the latter, a contact member pivoted on the reciprocating member, a fixed contact member with which one end of the pivoted contact member is adapted to engage, adjustable members located at opposite sides of the reciprocating memher and adapted to respectively engage the pivoted contact member to move the same out of and into engagement with the fixed contact member, a resilient member carried by the reciprocating member, and engaging the other end of the pivoted contact member to maintain the latter in either of said positions, an electric circuit including the electro-magnetic device, the said contacts and the resilient member, and means for moving the adjustable members to different positions to vary the movement of the ham mer beam.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOHN O. FIELDS. ROBERT L. FIELDS.

Vitnesses A. A. GEORGE, G. E. SOHIVNER,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

